Already at the time of assuming the position, he was suffering from tuberculosis and on Christmas two years later died from it, leaving behind a widow and a child.
[2] Krelj had a wide linguistic and philologic knowledge: besides Slovene, German and Latin, he knew Ancient Greek, Hebrew, Croatian and Glagolitic literature.
He introduced some changes to the Latin script originally adopted by Trubar from the German.
He consistently differentiated the phonemes /s/ /z/ /t͡s/ /ʃ/ /ʒ/ /t͡ʃ/ /t͡ɕ/ /ə/ (written by Krelj as ſ s z ſh sh zh ch à/è, modern orthography s z c š ž č ć e).
[3] In 1583, they were codified by Adam Bohorič in his grammar book Arcticae horulae succisivae.